Channel state information framework in full duplex systems

Abstract

Embodiments of the present disclosure relate to a channel state information (CSI) framework in a full duplex (FD) system. In accordance with some embodiments of the present disclosure, a UE may: determine a first type of CSI-RS and a second type of CSI-RS based on at least one CSI-RS resource setting and a particular configuration; and measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or an interference measurement of the CSI report.

Description

Technical Field

[0001] Embodiments of the present disclosure relate generally to wireless communication techniques, and more particularly, to a channel state information (CSI) framework in a full-duplex (FD) system. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. Wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources such as time, frequency, and power. Examples of wireless communication systems may include fourth generation (4G) systems such as long term evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, which may also be referred to as new radio (NR) systems.

[0003] In wireless communication systems, the term "duplex" may mean bidirectional communication between two devices, where "full-duplex" means that transmissions on the link in each direction occur simultaneously, and "half-duplex" means that transmissions on the link in each direction occur at mutually exclusive times. Details on the channel state information (CSI) framework in a full-duplex system need to be studied. Summary of the invention

[0004] Some embodiments of the present disclosure provide a user equipment (UE). The UE may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: determine a first type of CSI reference signal (CSI-RS) and a second type of CSI-RS based on at least one channel state information (CSI) reference signal (CSI-RS) resource setting and a specific configuration; and measure at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or interference measurement for a CSI report.

[0005] In some embodiments of the present disclosure, the processor is further configured to determine a first CSI reporting band and a second CSI reporting band based on the specific configuration.

[0006] In some embodiments of the present disclosure, the processor is further configured to: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and time domain restrictions are not configured for the CSI measurement of the CSI report, then derive the channel measurement or interference measurement of the first wideband CSI of the first CSI reporting band and the second wideband CSI of the second CSI reporting band by measuring the at least one of the first type of CSI-RS or the second type of CSI-RS; or if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and time domain restrictions are not configured for the CSI measurement of the CSI report, then derive the channel measurement or interference measurement of the first wideband CSI of the first CSI reporting band, the second wideband CSI of the second CSI reporting band, and the subband CSI of each subband in the first CSI reporting band by measuring the at least one of the first type of CSI-RS or the second type of CSI-RS.

[0007] In some embodiments of the present disclosure, the processor is further configured to: determine a differential value of the second wideband CSI relative to the first wideband CSI; quantize the differential value; and transmit the quantized differential value.

[0008] In some embodiments of the present disclosure, the processor is configured to determine a CSI reference resource associated with the CSI report, and wherein the CSI reference resource is in a valid downlink (DL) time slot including at least one downlink or variable symbol or at least one symbol having an uplink (UL) subband.

[0009] Some embodiments of the present disclosure provide a base station (BS). The BS may include: a transceiver; and a processor coupled to the transceiver. The processor may be configured to: determine a first type of CSI-RS and a second type of CSI-RS based on at least one channel state information (CSI) reference signal (CSI-RS) resource setting and a specific configuration of a UE; and receive a CSI report from the UE, wherein the CSI report is derived based on at least one of the first type of CSI-RS or the second type of CSI-RS.

[0010] In some embodiments of the present disclosure, the first type of CSI-RS and the second type of CSI-RS are determined based on a single CSI-RS resource setting associated with the CSI report and the specific configuration. In some embodiments of the present disclosure, the first type of CSI-RS exists in a first group of opportunities determined based on the single CSI-RS resource setting and excluding opportunities determined based on the specific configuration, and in each opportunity in the first group of opportunities, the first type of CSI-RS exists in a first group of physical resources determined based on the single CSI-RS resource setting. In some embodiments of the present disclosure, the second type of CSI-RS exists in a second group of opportunities determined based on the specific configuration, and in each opportunity in the second group of opportunities, the second type of CSI-RS exists in a second group of physical resources determined based on the single CSI-RS resource setting and excluding physical resources determined based on the specific configuration.

[0011] In some embodiments of the present disclosure, each of the first type of CSI-RS and the second type of CSI-RS is determined based on a corresponding CSI-RS resource setting in the at least one CSI-RS resource setting associated with the CSI report and the specific configuration. In some embodiments of the present disclosure, the first type of CSI-RS exists in a first group of opportunities determined based on the first CSI-RS resource setting in the at least one CSI-RS resource setting and excluding opportunities determined based on the specific configuration, and in each opportunity in the first group of opportunities, the first type of CSI-RS exists in a first group of physical resources determined based on the first CSI-RS resource setting. In some embodiments of the present disclosure, the second type of CSI-RS exists in a second group of opportunities determined based on the second CSI-RS resource setting in the at least one CSI-RS resource setting and only including opportunities determined based on the specific configuration, and in each opportunity in the second group of opportunities, the second type of CSI-RS exists in a second group of physical resources, and wherein the second group of physical resources is: determined based on the second CSI-RS resource setting, or includes the first group of physical resources excluding physical resources determined based on the specific configuration.

[0012] In some embodiments of the present disclosure, the processor is further configured to determine a first CSI reporting band and a second CSI reporting band based on the specific configuration. In some embodiments of the present disclosure, the first CSI reporting band includes a subband configured in the configuration of the CSI report, and the second CSI reporting band includes a subband configured in the configuration of the CSI report and does not include a subband overlapping with a frequency band determined based on the specific configuration.

[0013] In some embodiments of the present disclosure, the specific configuration indicates a set of opportunities and a physical resource within each opportunity in the set of opportunities.

[0014] In some embodiments of the present disclosure, the specific configuration indicates at least one physical downlink shared channel (PDSCH) rate matching mode, which indicates the set of opportunities and the physical resources within each opportunity in the set of opportunities, and wherein the physical resources cannot be used for PDSCH transmission. In some embodiments of the present disclosure, the specific configuration indicates the set of opportunities with uplink (UL) subbands and the physical resources of the UL subbands within each opportunity in the set of opportunities. In some embodiments of the present disclosure, the physical resources within each opportunity in the set of opportunities cannot be used for CSI-RS transmission.

[0015] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, receiving at least one of a first wideband CSI of the first CSI reporting band or a second wideband CSI of the second CSI reporting band. In some embodiments of the present disclosure, the at least one of the first wideband CSI of the first CSI reporting band or the second wideband CSI of the second CSI reporting band is derived based on a first type of CSI-RS in a first opportunity when the CSI-RS satisfies the time domain restriction. In some embodiments of the present disclosure, the first wideband CSI of the first CSI reporting band is derived based on a first type of CSI-RS in a second opportunity when the CSI-RS satisfies the time domain restriction or based on a second type of CSI-RS in the first opportunity when the CSI-RS satisfies the time domain restriction and the first type of CSI-RS in the second opportunity, and the second wideband CSI of the second CSI reporting band is derived based on the second type of CSI-RS in the first opportunity.

[0016] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a wideband CSI report and an aperiodic CSI report, receiving at least one of a first wideband CSI for the first CSI reporting band or a second wideband CSI for the second CSI reporting band. In some embodiments of the present disclosure, the at least one of the first wideband CSI for the first CSI reporting band or the second wideband CSI for the second CSI reporting band is derived based on a first type of CSI-RS in an opportunity associated with the aperiodic CSI report or based on a second type of CSI-RS in the opportunity associated with the aperiodic CSI report.

[0017] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, receiving at least one of a first wideband CSI for the first CSI reporting band, a second wideband CSI for the second CSI reporting band, or a subband CSI for each subband in the first CSI reporting band. In some embodiments of the present disclosure, the at least one of the first wideband CSI for the first CSI reporting band, the second wideband CSI for the second CSI reporting band, or the subband CSI for each subband in the first CSI reporting band is derived based on a first type of CSI-RS in a first opportunity where the CSI-RS satisfies the time domain restriction. In some embodiments of the present disclosure, the first wideband CSI of the first CSI reporting band and the subband CSI of each subband in the first CSI reporting band are derived based on the first type of CSI-RS in the second opportunity that meets the time domain restriction or based on the second type of CSI-RS in the first opportunity where the CSI-RS meets the time domain restriction and the first type of CSI-RS in the second opportunity, and the second wideband CSI of the second CSI reporting band is derived based on the second type of CSI-RS in the first opportunity.

[0018] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a subband CSI report and an aperiodic CSI report, receiving at least one of a first wideband CSI for the first CSI reporting band, a subband CSI for each subband in the first CSI reporting band, or a second wideband CSI for the second CSI reporting band. In some embodiments of the present disclosure, the at least one of the first wideband CSI for the first CSI reporting band, the subband CSI for each subband in the first CSI reporting band, or the second wideband CSI for the second CSI reporting band is derived based on a first type of CSI-RS in an opportunity associated with the aperiodic CSI report or based on a second type of CSI-RS in the opportunity associated with the aperiodic CSI report.

[0019] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is not configured for CSI measurement of the CSI report, then receiving a first wideband CSI of the first CSI reporting band and a second wideband CSI of the second CSI reporting band derived based on the at least one of the first type of CSI-RS or the second type of CSI-RS. In some embodiments of the present disclosure, if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is not configured for CSI measurement of the CSI report, then receiving a first wideband CSI of the first CSI reporting band, a second wideband CSI of the second CSI reporting band, and a subband CSI of each subband in the first CSI reporting band derived based on the at least one of the first type of CSI-RS or the second type of CSI-RS.

[0020] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for the CSI measurement of the CSI report, then: receiving a first wideband CSI for the first CSI reporting band and a second wideband CSI for the second CSI reporting band derived based on measuring a first type of CSI-RS in a first opportunity when the CSI-RS satisfies the time domain restriction; or receiving the first wideband CSI of the first CSI reporting band derived based on measuring a first type of CSI-RS in a second opportunity when the CSI-RS satisfies the time domain restriction or based on measuring a second type of CSI-RS in the first opportunity when the CSI-RS satisfies the time domain restriction and the first type of CSI-RS in the second opportunity, receiving the second wideband CSI for the second CSI reporting band derived based on measuring the second type of CSI-RS in the first opportunity, or both.

[0021] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a wideband CSI report and a non-periodic CSI report, then receiving at least one of a first wideband CSI for the first CSI reporting band or a second wideband CSI for the second CSI reporting band derived based on measuring a first type of CSI-RS in a timing associated with the non-periodic CSI report, or receiving the second wideband CSI for the second CSI reporting band derived based on measuring a second type of CSI-RS in the timing associated with the non-periodic CSI report.

[0022] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for the CSI measurement of the CSI report, then: receiving a first wideband CSI of the first CSI reporting band, a second wideband CSI of the second CSI reporting band, and a subband CSI of each subband in the first CSI reporting band derived based on measuring a first type of CSI-RS in a first opportunity when the CSI-RS satisfies the time domain restriction; or receiving the first wideband CSI of the first CSI reporting band and the subband CSI of each subband in the first CSI reporting band derived based on measuring a first type of CSI-RS in a second opportunity when the CSI-RS satisfies the time domain restriction or based on measuring a second type of CSI-RS in the first opportunity when the CSI-RS satisfies the time domain restriction and the first type of CSI-RS in the second opportunity, receiving the second wideband CSI of the second CSI reporting band derived based on measuring the second type of CSI-RS in the first opportunity, or both.

[0023] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with a subband CSI report and a non-periodic CSI report, then receiving at least one of a first wideband CSI of the first CSI reporting band derived based on measuring a first type of CSI-RS in a timing associated with the non-periodic CSI report, a subband CSI of each subband in the first CSI reporting band, or a second wideband CSI of the second CSI reporting band, or receiving the second wideband CSI of the second CSI reporting band and the subband CSI of each subband in the second CSI reporting band derived based on measuring a second type of CSI-RS in the timing associated with the non-periodic CSI report.

[0024] In some embodiments of the present disclosure, receiving the second wideband CSI includes receiving a quantized value of a differential value of the second wideband CSI relative to the first wideband CSI.

[0025] In some embodiments of the present disclosure, the processor is configured to determine a CSI reference resource associated with the CSI report, and wherein the CSI reference resource is in a valid downlink (DL) time slot including at least one downlink or variable symbol or at least one symbol having an uplink (UL) subband.

[0026] Some embodiments of the present disclosure provide a method performed by a UE. The method may include: determining a first type of channel state information (CSI) reference signal (CSI-RS) and a second type of CSI-RS based on at least one CSI resource setting and a specific configuration; and measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or interference measurement for a CSI report.

[0027] Some embodiments of the present disclosure provide a method performed by a BS. The method may include: determining a first type of channel state information (CSI) reference signal (CSI-RS) and a second type of CSI-RS based on at least one CSI resource setting and a specific configuration of a UE; and receiving a CSI report from the UE, wherein the CSI report is derived based on at least one of the first type of CSI-RS or the second type of CSI-RS.

[0028] Some embodiments of the present disclosure provide a device. According to some embodiments of the present disclosure, the device may include: at least one non-transitory computer-readable medium having computer-executable instructions stored thereon; at least one receiving circuit system; at least one transmitting circuit system; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuit system, and the at least one transmitting circuit system, wherein the at least one non-transitory computer-readable medium and the computer-executable instructions may be configured to cause the device to perform the method according to some embodiments of the present disclosure with the at least one processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to describe the manner in which the advantages and features of the present disclosure can be obtained, the description of the present disclosure is presented by reference to specific embodiments of the present disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the present disclosure and therefore should not be considered to limit its scope.

[0030] Figure 1 A schematic diagram illustrating a wireless communication system according to some embodiments of the present disclosure;

[0031] Figure 2 Describing exemplary duplex modes according to some embodiments of the present disclosure;

[0032] Figure 3 illustrating exemplary radio resources in a time division duplex (TDD) system according to some embodiments of the present disclosure;

[0033] Figure 4 illustrating exemplary subband configurations for CSI reporting according to some embodiments of the present disclosure;

[0034] Figure 5A and 5B illustrating exemplary CSI-RS resource allocation in the frequency domain according to some embodiments of the present disclosure;

[0035] Figure 6 Describing exemplary CSI-RS timing determination according to some embodiments of the present disclosure;

[0036] Figure 7 illustrating exemplary CSI-RS resource allocation according to some embodiments of the present disclosure;

[0037] Figure 8 A flowchart illustrating an exemplary wireless communication procedure according to some embodiments of the present disclosure;

[0038] Fig. 9 An exemplary method for determining the timing and resources of CSI-RS according to some embodiments of the present disclosure is described;

[0039] Fig.10 Describing exemplary CSI reporting bands according to some embodiments of the present disclosure;

[0040] Fig.11 and 12 Describing exemplary CSI reporting according to some embodiments of the present disclosure;

[0041] Fig.13 A flowchart illustrating an exemplary wireless communication procedure according to some embodiments of the present disclosure; and

[0042] Fig.14 A block diagram illustrating an exemplary apparatus according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0043] The detailed description of the accompanying drawings is intended as a description of the preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure can be practiced. It should be understood that the same or equivalent functions can be achieved by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure.

[0044] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architectures and new service scenarios (e.g., 3rd Generation Partnership Project (3GPP) 5G (NR), 3GPP Long Term Evolution (LTE), etc.). It is expected that, as network architectures and new service scenarios evolve, all embodiments in the present disclosure are also applicable to similar technical issues; and in addition, the terms listed in the present disclosure may be changed, which should not affect the principles of the present disclosure.

[0045] Figure 1 A schematic diagram illustrating a wireless communication system 100 according to some embodiments of the present disclosure.

[0046] like Figure 1 As shown in FIG. 1 , wireless communication system 100 may include some UEs (e.g., UE 101a and UE 101b) and BSs (e.g., BS 102). Figure 1 A specific number of UEs 101 and BSs 102 are depicted in FIG. 1 , but it is contemplated that any number of UEs and BSs may be included in the wireless communication system 100 .

[0047] UE 101 may include a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (such as a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a car computer, a network device (such as a router, a switch and a modem), or the like. According to some embodiments of the present disclosure, UE 101 may include a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network. In some embodiments of the present disclosure, UE 101 includes a wearable device, such as a smart watch, a fitness bracelet, an optical head-mounted display, or the like. In addition, UE 101 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal or a device, or described using other terms used in the art. UE 101 may communicate with BS 102 via an uplink (UL) communication signal.

[0048] BS 102 may be distributed over a geographic area. In certain embodiments of the present disclosure, BS 102 may also be referred to as an access point, access terminal, base station, base unit, macro cell, Node-B, evolved Node B (eNB), gNB, home Node-B, relay node or device, or described using other terms used in the art. BS 102 is typically part of a radio access network that may include one or more controllers communicatively coupled to one or more corresponding BS 102. BS 102 may communicate with UE 101 via downlink (DL) communication signals.

[0049] The wireless communication system 100 may be compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a network based on time division multiple access (TDMA), a network based on code division multiple access (CDMA), a network based on orthogonal frequency division multiple access (OFDMA), an LTE network, a network based on 3GPP, a 3GPP 5G network, a satellite communication network, a high altitude platform network, and / or other communication networks.

[0050] In some embodiments of the present disclosure, the wireless communication system 100 is compatible with 5G NR of the 3GPP protocol. For example, the BS 102 may transmit data using an orthogonal frequency division multiplexing (OFDM) modulation scheme on the DL and the UE 101 may transmit data using a discrete Fourier transform-spread spectrum-orthogonal frequency division multiplexing (DFT-S-OFDM) or cyclic prefix-OFDM (CP-OFDM) scheme on the UL. However, more generally, the wireless communication system 100 may implement some other open or proprietary communication protocols, such as WiMAX and other protocols.

[0051] In some embodiments of the present disclosure, BS 102 and UE 101 may communicate using other communication protocols, such as the IEEE 802.11 series of wireless communication protocols. In addition, in some embodiments of the present disclosure, BS 102 and UE 101 may communicate via licensed spectrum, while in some other embodiments, BS 102 and UE 101 may communicate via unlicensed spectrum. The present disclosure is not intended to be limited to implementing any particular wireless communication system architecture or protocol.

[0052] In wireless communication systems, the term "duplex" may mean bidirectional communication between two devices, where "full-duplex" means transmissions on the link in each direction occur simultaneously and "half-duplex" means transmissions on the link in each direction occur at mutually exclusive times.

[0053] Figure 2 Exemplary duplex modes according to some embodiments of the present disclosure are described.

[0054] refer to Figure 2 The duplex mode may include, for example, a full-duplex frequency division duplex (FD-FDD) mode, a TDD mode, and a half-duplex frequency division duplex (HD-FDD) mode.

[0055] In some examples, in a full-duplex transceiver, different carrier frequencies (e.g., carrier A and carrier B) may be used for transmission in each link direction, e.g., carrier A may be used for uplink transmissions, while carrier B may be used for downlink transmissions. Such full-duplex may be referred to as FD-FDD mode.

[0056] In a half-duplex (HD) transceiver, the transmissions in each link direction may be separated by time domain resources. In some cases, the same carrier frequency is used for transmissions in each link direction, e.g., carrier A is used for both uplink and downlink transmissions, whereby such half-duplex may be referred to as TDD mode. In some other cases, different carrier frequencies may be used for transmissions in each link direction, e.g., carrier A may be used for uplink transmissions and carrier B may be used for downlink transmissions, whereby such half-duplex may be referred to as HD-FDD mode.

[0057] Embodiments of the present disclosure provide improvements in duplex mode, for example, Figure 2 . For example, an advanced full-duplex mode is provided that enables simultaneous transmission and reception by the same device on the same carrier. The advanced full-duplex mode is advantageous. For example, the advanced full-duplex mode can improve link throughput. In addition, the transmission delay in the advanced full-duplex mode can also be reduced due to simultaneous bidirectional transmission.

[0058] However, simultaneous DL transmission and UL transmission in the same carrier may cause self-interference. For example, on the BS side, DL transmission may pollute UL reception, while on the UE side, UL transmission may pollute DL reception.

[0059] It is more feasible to implement full duplex on the BS side than on the UE side for the following reasons. First, more space can be used on the BS side so that the transmitter (Tx) and receiver (Rx) antenna branches can be separated to achieve self-interference cancellation. In addition, more complex and advanced transceivers or receivers can be used on the BS side, which can be the basis for self-interference cancellation.

[0060] In view of the above, one scenario for implementing full duplex is to deploy full duplex mode only on the BS side, while still deploying half duplex mode on the UE side. In this scenario, in a time unit (e.g., represented by a slot, symbol, sub-slot, etc.) with full duplex mode, the BS may perform UL reception from some UEs while performing DL transmission to some other UEs. Non-overlapping frequency resources in the time unit may be allocated to UL reception (from some UEs) and DL transmission (to some other UEs) to mitigate self-interference.

[0061] Full-duplex mode may be used in a TDD system to improve UL performance. For example, UL subbands may be configured in some DL time slots so that more resources may be used for UL transmission. Such full-duplex mode may be referred to as sub-band full-duplex (SBFD). From the perspective of a UE, a UE may be classified as an SBFD-aware UE (i.e., aware full-duplex in the BS side) and an SBFD-unaware UE, depending on the UE capabilities. In the context of the present disclosure, for an SBFD-aware UE configured with an UL subband, a DL time slot with an UL subband may also be referred to as an SBFD time slot, and a DL time slot without an UL subband may also be referred to as a non-SBFD time slot.

[0062] When SBFD is on the BS side, UL subbands may be configured in some DL time slots so that UL transmissions may extend into such (type of) UL subbands in the DL time slots, while DL transmissions may be scheduled in resources outside the UL subbands. For example, in a SBFD time slot, PUSCH may be scheduled in the UL subbands for some UEs, while Physical Downlink Shared Channel (PDSCH) may be scheduled in resources outside the UL subbands for other UEs.

[0063] A UL subband may correspond to a set of frequency domain resources (e.g., a set of resource elements (REs) or resource blocks (RBs)) and may be applicable for a duration that may be configured by the BS. It should be noted that for SBFD-aware UEs, they may or may not be configured with UL subbands. This may depend on whether the UE requires UL performance enhancement. Although the term "subband" is used to describe embodiments of the present disclosure, other terms corresponding to resource allocations similar to subbands (e.g., bandwidth portions) may also be applicable to embodiments of the present disclosure.

[0064] Figure 3 Exemplary radio resources in a time division duplex (TDD) system according to some embodiments of the present disclosure are described.

[0065] In some examples, in a TDD system, DL transmissions and UL transmissions may be separated by time domain resources (e.g., time slots). For example, DL transmissions may be Figure 3 The DL transmission is performed in slots #n to #n+2 as shown in FIG. 1 , while the UL transmission may be performed in slots #n to #n+2 as shown in FIG. Figure 3 It is performed in UL time slots #n+3 and #n+4 shown in .

[0066] SBFD on the BS side can be introduced to Figure 3 For example, in addition to the UL transmissions that can be scheduled in the effective UL bandwidth part (BWP) in the UL time slot, in the TDD system, the UL transmissions can also be scheduled in the subbands in the DL time slot. Figure 3 , UL transmission may occur in subbands in DL slots #n+1 and #n+2. In other words, slots #n+1 and #n+2 are configured with UL subbands.

[0067] In some embodiments of the present disclosure, the UE may be configured to report CSI to the BS so that the BS can, for example, determine the precoding of the antenna ports and determine the link adaptation strategy for data transmission. Depending on the configuration, the CSI may be information such as a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), a signal-to-interference-plus-noise ratio (SINR), a CSI-RS resource indicator (CRI), etc. The CSI may be derived by the UE based on channel measurements, interference measurements, or both of the configured CSI-RS resources. In the context of the present disclosure, CSI measurements may refer to channel measurements, interference measurements, or both.

[0068] In some embodiments of the present disclosure, a flexible CSI framework is introduced in a communication system (e.g., a 5G system). Under this framework, CSI reporting can be decoupled from CSI measurement on configured resources to support flexible transmission modes. For example, a UE can be configured with a set of CSI report settings (e.g., CSI-ReportConfig specified in the 3GPP specification) and a set of CSI-RS resource settings (e.g., CSI-ResourceConfig specified in the 3GPP specification).

[0069] In some embodiments of the present disclosure, the CSI report settings may indicate the content of the CSI report, such as what CSI parameters to report (or quantities such as CQI, PMI, RI, CRI, SINR, etc.), frequency granularity (such as wideband CSI reporting or subband CSI reporting), and time domain behavior (such as periodic, non-periodic, or semi-persistent reporting).

[0070] For wideband CSI reporting, the UE may report CSI for a CSI reporting band that may include all allocated subbands (hereinafter referred to as "wideband CSI"). In the context of the present disclosure, "wideband CSI" may refer to "wideband CSI of a codeword". For subband CSI reporting, in addition to the wideband CSI, the UE may also report CSI for each subband in the CSI reporting band (hereinafter referred to as "subband CSI"). In the context of the present disclosure, "subband CSI" may refer to "subband CSI of a codeword". It should be noted that the subband used for CSI reporting may have a different definition from the UL subband used for full duplex.

[0071] Figure 4 An exemplary subband configuration for CSI reporting according to some embodiments of the present disclosure is described. Figure 4 In the example of FIG. 5 , it is assumed that a BWP (eg, a DL BWP) includes 12 subbands.

[0072] In some examples, a CSI reporting band may include subbands marked in gray, such as Figure 4 In some embodiments, a bitmap (e.g., represented as "subbands12") may be used to indicate the subbands included in the CSI reporting band. For example, the bitmap "subbands12" may indicate "110110011111", where a value of "1" indicates that the corresponding subband of the BWP is included in the CSI reporting band, and a value of "0" indicates that the corresponding subband of the BWP is not included in the CSI reporting band.

[0073] In some embodiments of the present disclosure, a CSI-RS resource setting may configure resources (e.g., CSI-RS resources) for channel measurement, interference measurement, or both. In some instances, two types of resource settings may be configured, for example, based on non-zero power (NZP) CSI-RS resources or based on CSI interference measurement (CSI-IM) resources. NZP CSI-RS resources may be used for channel measurement, interference measurement, or both. CSI-IM resources may only be used for interference measurement. For example, when NZP CSI-RS resources are configured in a CSI report setting and CSI-IM resources are not configured, both channel measurement and interference measurement may be performed based on configuring NZP CSI-RS resources. For example, when both NZP CSI-RS resources and CSI-IM resources are configured, channel measurement may be performed based on configuring NZP CSI-RS resources and interference measurement may be performed based on configuring CSI-IM resources. In the context of the present disclosure, a CSI-RS resource may be a NZP CSI-RS resource or a CSI-IM resource.

[0074] In some embodiments of the present disclosure, resource settings may also be associated with time domain behavior, which may be periodic, aperiodic, or semi-persistent. For example, periodic CSI-RS resources are associated with periodicity and time slot offsets and are assumed to always exist once they are configured to the UE. For example, semi-persistent CSI-RS resources are configured with periodicity and time slot offsets similar to periodic resources. However, it is assumed that the semi-persistent CSI-RS resources are not activated when they are first configured (e.g., by RRC). In order to activate the CSI-RS resources, an activation command needs to be transmitted (e.g., using a media access control (MAC) control element (CE) message). In response to receiving this activation command, the UE may assume that the resources are valid and exist until a deactivation command is received (e.g., using a MAC CE message). For example, aperiodic CSI-RS resources (or aperiodic CSI-IM resources) only exist when explicitly triggered (e.g., by downlink control information (DCI)) and constitute a one-time transmission.

[0075] In some embodiments of the present disclosure, in the frequency domain, CSI-RS resources may be allocated using a continuous allocation in the form of a "starting RB" and a "number of RBs". In some embodiments of the present disclosure, it may be further configured whether the CSI-RS is allocated per RB or every other RB. For example, in addition to indicating the starting RB and the number of RBs for continuous resource allocation, additional parameters may be used to indicate that every other allocated RB is used as an available RB for CSI-RS resources.

[0076] Figure 5A and 5B Exemplary CSI-RS resource allocation in the frequency domain according to some embodiments of the present disclosure is illustrated.

[0077] like Figure 5A As shown in FIG. 1 , CSI-RS resources can be allocated within a BWP. For example, a UE can be configured with a starting RB (S1) and a number of RBs (L1) for CSI-RS resources, and can determine the location of CSI-RS resources in the frequency domain (e.g., Figure 5A The UE can expect the CSI-RS to be in the allocated RB (e.g. Figure 5A The gray blocks in the figure are transmitted in each RB.

[0078] like Figure 5B As shown in FIG. 1 , CSI-RS resources may be allocated within a BWP. For example, the UE may be configured with a starting RB (S2) and a number of RBs (L2) for the CSI-RS resources. The UE may further be configured with a parameter indicating that the CSI-RS is allocated every other RB. The UE may determine the location of the CSI-RS resources in the frequency domain (e.g., Figure 5B The UE can expect the CSI-RS to be in the allocated RB (e.g. Figure 5B The gray blocks in the figure are transmitted in every other RB.

[0079] It should be noted that "transmitting CSI-RS in an RB" does not necessarily mean that the CSI-RS will occupy all REs of the RB. Based on network configuration, the CSI-RS may occupy only some REs of the RB.

[0080] In some embodiments of the present disclosure, each CSI report setting may be associated with one or more resource settings for channel measurement or interference measurement. For a CSI report in a specific time slot (e.g., time slot n), the UE may determine the CSI reference resource in the time slot before time slot n (e.g., time slot m). The time slot of the CSI reference resource shall be a valid DL time slot. If a time slot contains at least one higher layer configured downlink or variable symbol, it shall be considered a valid DL time slot. The value of m for periodic, aperiodic, and semi-persistent CSI reports may be different.

[0081] In some embodiments of the present disclosure, for channel measurement or interference measurement, when time domain restriction is configured for CSI measurement, the channel or interference of the CSI reported in time slot n may be measured based on the nearest opportunity with associated CSI-RS before the CSI reference resource (e.g., time slot m). Otherwise, when time domain restriction is not configured, which CSI-RS resources before the CSI reference resource (e.g., time slot m) are used for channel or interference measurement may depend on the implementation of the UE.

[0082] Figure 6 Exemplary CSI-RS timing determination according to some embodiments of the present disclosure is described.

[0083] exist Figure 6In the example, it is assumed that the UE needs to transmit a CSI report in time slot n. The CSI reference source associated with the CSI report may be defined at time slot m. The CSI report may be associated with a CSI resource with a CSI-RS transmission periodicity, such as Figure 6 There may be multiple CSI-RS opportunities before time slot m (eg, in time slots k, k1, and k2).

[0084] If time domain restrictions are configured for CSI measurement of a CSI report, the UE may determine the CSI-RS opportunity in time slot k, which is the closest opportunity before the CSI reference resource of the CSI report. In some embodiments, there may be a predefined time gap, and the time gap between the closest CSI-RS opportunity and the CSI-RS reference resource (e.g. Figure 6 The time gap shown in ( ) should be larger than the predefined time gap. The UE may measure the CSI-RS in time slot k to derive the CSI measurement for the CSI report in time slot n.

[0085] If time domain restriction is not configured, the UE may determine one or more CSI-RS opportunities before the CSI reference resource to derive CSI measurements. For example, the UE may measure CSI-RS in time slot k1 and time slot k to derive CSI measurements for CSI reports in time slot n.

[0086] As described above, continuous frequency domain resource allocation may be applied to CSI-RS. On the other hand, in a cell with SBFD, for periodic or semi-persistent CSI-RS, some time units (e.g., time slots) in which CSI-RS transmission may occur may be configured with UL subbands, while other time units may not. In addition, non-periodic CSI-RS may be scheduled to be transmitted in time slots with or without UL subbands. Therefore, when some CSI-RS RBs or REs overlap with UL subbands, CSI-RS cannot be transmitted in such RBs / REs because they are to be used for UL transmission. Correspondingly, if the UE still measures CSI-RS in all CSI-RS resources in time slots with UL subbands, it cannot obtain accurate CSI.

[0087] For example, refer to Figure 7 , the UE may be configured with a continuous frequency domain resource allocation that may include CSI-RS for two DL subbands and one UL subband in a DL slot. Since the UL subband can be used for UL transmission, the CSI-RS cannot be Figure 7 Transmission in the UL sub-band shown in .

[0088] If the UE can Figure 7In the example shown in FIG. 1 , it is beneficial to report CSI of two non-contiguous DL subbands to achieve efficient link adaptation of PDSCH transmitted in the two DL subbands. In addition, it is beneficial for the CSI framework to support UE to report CSI of both SBFD time slots and non-SBFD time slots so that PDSCH transmitted in both time slots can achieve efficient link adaptation.

[0089] Embodiments of the present disclosure provide solutions to solve the above problems. For example, in some embodiments, for channel measurement or interference measurement used to calculate the CSI value of the CSI report, two types of CSI-RS may be determined based on a specific configuration. For example, in some embodiments, for wideband or subband CSI reporting, two CSI reporting bands may be determined based on a specific configuration. For example, in some embodiments, when determining the CSI-RS timing for channel measurement or interference measurement, the CSI-RS type in the CSI-RS timing is considered. More details about the embodiments of the present disclosure will be described below in conjunction with the accompanying drawings.

[0090] Figure 8 Flowchart illustrating an exemplary wireless communication procedure 800 according to some embodiments of the present disclosure. The procedure 800 may be performed by a UE (e.g. Figure 1 UE 101 shown in FIG. 1 ) executes.

[0091] refer to Figure 8 In operation 811, the UE may determine a first type of CSI-RS and a second type of CSI-RS based on at least one CSI-RS resource setting and a specific configuration. The above description about the CSI-RS resource setting is applicable here. Details about the first and second types of CSI-RS and the specific configuration will be described in detail below.

[0092] In operation 813, the UE may measure at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or an interference measurement for a CSI report.

[0093] In some embodiments, measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive channel measurement or interference measurement for a CSI report may include at least one of: measuring the first type of CSI-RS to derive channel measurement or interference measurement for a CSI report; or measuring the second type of CSI-RS to derive channel measurement or interference measurement for a CSI report; or measuring the first type of CSI-RS and the second type of CSI-RS to derive channel measurement or interference measurement for a CSI report.

[0094] The details of CSI measurement and CSI reporting will be described in detail below.

[0095] In some embodiments of the present disclosure, a specific configuration may indicate a set of opportunities and physical resources within each opportunity in the timing group. For example, a specific configuration may indicate a set of opportunities and physical resources within each opportunity in the timing group that cannot be used for CSI-RS transmission.

[0096] The specific configuration may be implemented in various forms. For example, resources that cannot be used for CSI-RS transmission may be implicitly or explicitly indicated by the specific configuration.

[0097] For example, in some embodiments of the present disclosure, a specific configuration indicates at least one physical downlink shared channel (PDSCH) rate matching mode, which indicates a set of opportunities and physical resources within each opportunity in the time group, and wherein the physical resources cannot be used for PDSCH transmission. Since the physical resources cannot be used for PDSCH transmission, they cannot be used for CSI-RS transmission. In this way, the resources that cannot be used for CSI-RS transmission are implicitly indicated. In some examples, the rate matching mode can be configured so that it corresponds to the UL subband configuration of SBFD.

[0098] For example, in some embodiments of the present disclosure, a specific configuration corresponds to a UL subband configuration. For example, the specific configuration indicates a set of opportunities (e.g., a set of SBFD time slots) with UL subbands and the physical resources of the UL subbands within each opportunity in the time group. In this way, resources that cannot be used for CSI-RS transmission are implicitly indicated.

[0099] For example, in some embodiments of the present disclosure, a specific configuration indicates a set of occasions and the physical resources within each occasion in the occasion group where CSI-RS is unavailable. In other words, the physical resources within each occasion in the occasion group cannot be used for CSI-RS transmission. In this way, the resources that cannot be used for CSI-RS transmission are explicitly indicated.

[0100] In some embodiments of the present disclosure, at least one CSI-RS resource setting based on which the type of CSI-RS is determined may be a single CSI-RS resource setting associated with the CSI report. For example, a first type of CSI-RS and a second type of CSI-RS are determined based on a single CSI-RS resource setting associated with the CSI report and a specific configuration.

[0101] In some embodiments, the first type of CSI-RS is present in a group of opportunities (denoted as opportunity group #1A) determined based on a single CSI-RS resource setting and excluding opportunities determined based on a specific configuration (e.g., SBFD time slots). In some embodiments, the second type of CSI-RS is present in a group of opportunities (denoted as opportunity group #1B) determined based on a specific configuration. For example, opportunity group #1B may include SBFD time slots.

[0102] In some embodiments, in each opportunity in opportunity group #1A, the first type CSI-RS exists in a set of physical resources (denoted as physical resource group #1A) determined based on a single CSI-RS resource setting. In some embodiments, in each opportunity in opportunity group #1B, the second type CSI-RS exists in a set of physical resources (denoted as physical resource group #1B) determined based on a single CSI-RS resource setting and excluding physical resources determined based on a specific configuration. For example, the physical resources determined based on the specific configuration may be physical resources of a UL subband.

[0103] In some embodiments of the present disclosure, at least one CSI-RS resource setting based on which the type of the CSI-RS is determined may be a plurality of CSI-RS resource settings associated with the CSI report. For example, each of the first type of CSI-RS and the second type of CSI-RS is determined based on a corresponding CSI-RS resource setting and a specific configuration in at least one CSI-RS resource setting associated with the CSI report.

[0104] In some embodiments, the first type of CSI-RS exists in a group of opportunities (denoted as opportunity group #2A) determined based on a CSI-RS resource setting (denoted as CSI-RS resource setting #A) in at least one CSI-RS resource setting and does not include opportunities determined based on a specific configuration. In some embodiments, the second type of CSI-RS exists in a group of opportunities (denoted as opportunity group #2B) determined based on another CSI-RS resource setting (denoted as CSI-RS resource setting #B) in at least one CSI-RS resource setting and only includes opportunities determined based on a specific configuration. The opportunity determined based on the specific configuration may be a SBFD time slot.

[0105] In some embodiments, in each opportunity in opportunity group #2A, the first type CSI-RS is present in a set of physical resources (denoted as physical resource group #2A) determined based on CSI-RS resource setting #A. In some embodiments, in each opportunity in opportunity group #2B, the second type CSI-RS is present in a set of physical resources (denoted as physical resource group #2B). In some instances, physical resource group #2B is determined based on CSI-RS resource setting #B. For example, non-contiguous frequency domain resource allocation (FDRA) may be applied to CSI-RS resource setting #B. In some instances, physical resource group #2B is determined based on CSI-RS resource setting #A that does not include physical resources determined based on a specific configuration. For example, the physical resources determined based on the specific configuration may be physical resources of a UL subband.

[0106] In some embodiments of the present disclosure, each of timing group #1A, timing group #1B, timing group #2A, and timing group #2B may include one or more time slots.

[0107] Fig. 9 An exemplary method for determining the timing and resources of CSI-RS according to some embodiments of the present disclosure is described. Fig. 9 In the present invention, it is assumed that the type of CSI-RS is determined based on a single CSI-RS resource setting and the CSI-RS is allocated per RB.

[0108] The UE may receive a CSI-RS resource setting and a specific configuration from the BS. The CSI-RS resource setting may indicate the starting RB and the number of RBs of the CSI-RS resource, such as Fig. 9 Multiple CSI-RS opportunities (eg, time slots #n1 to #n4) may also be determined based on the CSI-RS resource configuration.

[0109] Assume that the specific configuration is a UL subband configuration. Based on the specific configuration, the UE may know the location of the SBFD time slots and the location of the UL subbands in each time slot. For example, the UE may determine that time slot #n2 includes a UL subband, such as Fig. 9 , and time slots #n1, #n3, and #n4 do not include any UL subband. That is, time slot #n2 is a SBFD time slot and time slots #n1, #n3, and #n4 are non-SBFD time slots.

[0110] Based on the CSI-RS resource setting and the specific configuration, the UE may determine that the first type CSI-RS exists in time slots #n1, #n3, and #n4 (e.g., excluding time slot #n2). Taking time slot #n1 as an example, the UE may determine that the first type CSI-RS exists in the RB marked in gray in time slot #n1. The UE may similarly determine the location of the first type CSI-RS in time slots #n3 and #n4.

[0111] Based on the CSI-RS resource setting and the specific configuration, the UE may determine that the second type of CSI-RS is present in time slot #n2. The UE may determine that the second type of CSI-RS is present in the RBs marked in gray (eg, excluding RBs occupied by the UL subband) in time slot #n2.

[0112] In some embodiments of the present disclosure, the UE may determine two CSI reporting bands (denoted as CSI reporting band #1 and CSI reporting band #2) based on a specific configuration, as described above.

[0113] For example, the UE may determine CSI reporting band #1 and CSI reporting band #2 based on the CSI reporting configuration (or CSI reporting setting) and the specific configuration. In some embodiments of the present disclosure, CSI reporting band #1 may include subbands configured in the CSI reporting configuration. CSI reporting band #2 may include subbands configured in the CSI reporting configuration and does not include subbands overlapping with the frequency band determined based on the specific configuration.

[0114] For example, returning a reference Figure 4 , the UE may receive a CSI report configuration from the BS, which may include Figure 4 In some embodiments, the UE may determine that CSI reporting band #1 includes Figure 4 The subbands marked in grey are shown in FIG. 1 (i.e., the subbands included in the CSI reporting configuration).

[0115] The UE may determine CSI reporting band #2 based on a specific configuration from the BS. Fig.10 , the specific configuration is a UL subband configuration, and it may indicate UL subbands that may occupy some of the subbands indicated in the CSI reporting configuration (marked with a dashed box) and some subbands not indicated in the CSI reporting configuration. The UE may determine that CSI reporting band #2 includes subbands marked in gray, such as Fig.10 Displayed in.

[0116] In some embodiments of the present disclosure, it is assumed that CSI reporting is configured with wideband CSI reporting and periodic or semi-persistent CSI reporting and time domain restriction is configured for channel measurement or interference measurement of the CSI reporting.

[0117] In these embodiments, when the timing (denoted as timing #1A) at which the CSI-RS satisfies the time domain restriction (e.g., the most recent timing before the CSI reference resource associated with the CSI report that has the CSI-RS associated with the CSI report) has a CSI-RS of the first type, measuring at least one of the first type of CSI-RS or the second type of CSI-RS in operation 813 to derive the channel measurement or interference measurement of the CSI report may include measuring the first type of CSI-RS in timing #1A.

[0118] In these embodiments, when timing #1A has a CSI-RS of the second type, the UE may determine a timing (denoted as timing #1B) having a CSI-RS of the first type and satisfying the time domain restriction. That is, the UE may locate the nearest timing (timing #1B) having a CSI-RS of the first type associated with the CSI report before the CSI reference resource associated with the CSI report. The channel measurement or interference measurement that measures at least one of the CSI-RS of the first type or the CSI-RS of the second type to derive the CSI report may include measuring at least one of the CSI-RS of the first type in the second timing or the CSI-RS of the second type in the first timing.

[0119] The UE may derive at least one of a channel measurement or interference measurement of a wideband CSI for CSI reporting band #1 or a channel measurement or interference measurement of another wideband CSI for CSI reporting band #2 based on measurements of at least one of the first type of CSI-RS and the second type of CSI-RS.

[0120] In some examples, when opportunity #1A has a first type of CSI-RS, the UE may measure the first type of CSI-RS in opportunity #1A to derive channel measurement or interference measurement of wideband CSI for CSI reporting band #1 (denoted as wideband CSI #1A) and another wideband CSI for CSI reporting band #2 (denoted as wideband CSI #2A). The UE may report both wideband CSI #1A and wideband CSI #2A to the BS in a CSI report. In some examples, the UE may measure the first type of CSI-RS in opportunity #1A to derive channel measurement or interference measurement for the CSI report and report only wideband CSI #1A.

[0121] In some examples, when timing #1A has a second type of CSI-RS, the UE may perform at least one of the following: (1) measuring the first type of CSI-RS in timing #1B or measuring the second type of CSI-RS in timing #1A and the first type of CSI-RS in timing #1B to derive channel measurement or interference measurement of wideband CSI of CSI reporting band #1 (denoted as wideband CSI #1B); or (2) measuring the second type of CSI-RS in timing #1A to derive channel measurement or interference measurement of another wideband CSI of CSI reporting band #2 (denoted as wideband CSI #2B). In some examples, the UE may only measure the second type of CSI-RS in timing #1A to derive channel measurement or interference measurement for CSI reporting and report only wideband CSI #2B. In this case, the UE does not need to locate the nearest timing (e.g., timing #1B) with the first type of CSI-RS.

[0122] In some examples, the UE may perform both measurement (1) and measurement (2), and may report both wideband CSI #1B and wideband CSI #2B to the BS in the CSI report. In some examples, the UE may perform only measurement (1) and may report only wideband CSI #1B to the BS in the CSI report.

[0123] In some examples, the UE may only perform measurement (2) and may report only wideband CSI #2B to the BS in the CSI report. In these examples, the UE does not need to locate occasion #1B.

[0124] In some embodiments of the present disclosure, it is assumed that the CSI report is configured with wideband CSI reporting and periodic or semi-persistent CSI reporting and no time domain restriction is configured for channel measurement or interference measurement of the CSI report.

[0125] In these embodiments, the UE may derive a channel measurement or interference measurement of a wideband CSI for CSI reporting band #1 and another wideband CSI for CSI reporting band #2 by measuring at least one of the first type of CSI-RS or the second type of CSI-RS. The UE may report two wideband CSIs to the BS in a CSI report.

[0126] For example, the UE may measure at least one CSI-RS of the first CSI-RS type before the associated CSI reference resource to derive wideband CSI for CSI reporting band #1 and another wideband CSI for CSI reporting band #2. For example, the UE may measure at least one CSI-RS of the first CSI-RS type and at least one CSI-RS of the second CSI-RS type before the associated CSI reference resource to derive wideband CSI for CSI reporting band #1 and another wideband CSI for CSI reporting band #2. For example, the UE may measure at least one CSI-RS of the second CSI-RS type before the associated CSI reference resource to derive wideband CSI for CSI reporting band #2.

[0127] In some embodiments of the present disclosure, it is assumed that the CSI report is configured with wideband CSI reporting and aperiodic reporting.

[0128] In these embodiments, measuring at least one of the first type of CSI-RS or the second type of CSI-RS in operation 813 to derive a channel measurement or interference measurement for the CSI report may include measuring a CSI-RS in an opportunity associated with an aperiodic CSI report (denoted as CSI-RS#A). The CSI-RS may be an aperiodic triggered CSI-RS or a periodic or semi-persistent CSI-RS. The UE may derive at least one of a channel measurement or interference measurement for a wideband CSI of CSI reporting band #1 or a channel measurement or interference measurement for another wideband CSI of CSI reporting band #2.

[0129] In some instances, when CSI-RS#A is a first type of CSI-RS (or when the associated timing has a first type of CSI-RS), measuring CSI-RS#A may include measuring the first type of CSI-RS to derive a channel measurement or interference measurement of at least one of a wideband CSI for CSI reporting band #1 (denoted as wideband CSI#1C) or another wideband CSI for CSI reporting band #2 (denoted as wideband CSI#2C).

[0130] For example, the UE may obtain only wideband CSI#1C and report wideband CSI#1C to the BS in a CSI report. For example, the UE may obtain both wideband CSI#1C and wideband CSI#2C and report both wideband CSI#1C and wideband CSI#2C to the BS in a CSI report. For example, whether wideband CSI#1C, wideband CSI#2C, or both should be reported may be based on a configuration from the BS or predefined in a standard, for example.

[0131] In some examples, when CSI-RS#A is a CSI-RS of the second type (or when the associated opportunity has a CSI-RS of the second type), measuring CSI-RS#A may include measuring the CSI-RS of the second type to derive a channel measurement or interference measurement of wideband CSI for CSI reporting band #2 (denoted as wideband CSI#2D). The UE may report wideband CSI#2D to the BS in a CSI report.

[0132] In some embodiments, considering that aperiodic CSI reporting is usually targeted at evaluating short-term transmission assumptions, the UE does not need to report both the wideband CSI of CSI reporting band #1 and the wideband CSI of CSI reporting band #2.

[0133] In some embodiments of the present disclosure, it is assumed that CSI reporting is configured with subband CSI reporting and periodic or semi-persistent CSI reporting and time domain restriction is configured for channel measurement or interference measurement of the CSI reporting.

[0134] In these embodiments, when the timing (denoted as timing #1A') at which the CSI-RS satisfies the time domain restriction (e.g., the most recent timing before the CSI reference resource associated with the CSI report that has the CSI-RS associated with the CSI report) has a CSI-RS of the first type, measuring at least one of the first type of CSI-RS or the second type of CSI-RS in operation 813 to derive the channel measurement or interference measurement of the CSI report may include measuring the first type of CSI-RS in timing #1A'.

[0135] In these embodiments, when timing #1A' has a CSI-RS of the second type, the UE may determine a timing (denoted as timing #1B') having a CSI-RS of the first type and satisfying the time domain restriction. That is, the UE may locate the nearest timing (timing #1B') having a CSI-RS of the first type associated with the CSI report before the CSI reference resource associated with the CSI report. The channel measurement or interference measurement that measures at least one of the CSI-RS of the first type or the CSI-RS of the second type to derive the CSI report may include measuring at least one of the CSI-RS of the first type in the second timing or the CSI-RS of the second type in the first timing.

[0136] The UE may derive at least one of channel measurement or interference measurement for wideband CSI for CSI reporting band #1, another wideband CSI for CSI reporting band #2, and subband CSI for each subband in CSI reporting band #1.

[0137] In some examples, when opportunity #1A' has a first type of CSI-RS, the UE may measure the first type of CSI-RS in opportunity #1A' to derive a wideband CSI (denoted as wideband CSI #1A') for CSI reporting band #1, another wideband CSI (denoted as wideband CSI #2A') for CSI reporting band #2, and a channel measurement or interference measurement of the subband CSI for each subband in CSI reporting band #1. The UE may report the wideband CSI #1A', the wideband CSI #2A', and the subband CSI for each subband in CSI reporting band #1 to the BS in a CSI report. In some examples, the UE may measure the first type of CSI-RS in opportunity #1A' to derive a channel measurement or interference measurement for the CSI report and report only the wideband CSI #1A' and the subband CSI for each subband in CSI reporting band #1.

[0138] In some examples, when timing #1A' has the second type of CSI-RS, the UE may perform at least one of the following: (1') measuring the first type of CSI-RS in timing #1B' or measuring the second type of CSI-RS in timing #1A' and the first type of CSI-RS in timing #1B' to derive a channel measurement or interference measurement of a wideband CSI of CSI reporting band #1 (denoted as wideband CSI #1B') and a subband CSI of each subband in CSI reporting band #1; or (2') measuring the second type of CSI-RS in timing #1A' to derive a channel measurement or interference measurement of another wideband CSI (denoted as wideband CSI #2B') of CSI reporting band #2. In some examples, the UE may measure only the second type of CSI-RS in timing #1A' to derive a channel measurement or interference measurement for CSI reporting and report only wideband CSI #2B' and the subband CSI of each subband in CSI reporting band #2. In this case, the UE does not need to locate the nearest opportunity (eg, opportunity #1B') with the first type of CSI-RS.

[0139] In some examples, the UE may perform both measurement (1') and measurement (2'), and may report wideband CSI #1B', wideband CSI #2B', and subband CSI for each subband in CSI reporting band #1 to the BS in a CSI report. In some examples, the UE may perform only measurement (1') and may report wideband CSI #1B' and subband CSI for each subband in CSI reporting band #1 to the BS in a CSI report.

[0140] In some examples, the UE may perform only measurement (2') and may report wideband CSI #2B' and subband CSI for each subband in CSI reporting band #2 to the BS in a CSI report. In these examples, the UE does not need positioning opportunity #1B'.

[0141] In some embodiments of the present disclosure, it is assumed that CSI reporting is configured with subband CSI reporting and periodic or semi-persistent CSI reporting and no time domain restriction is configured for channel measurement or interference measurement of the CSI reporting.

[0142] In these embodiments, the UE may derive channel measurement or interference measurement of the wideband CSI of CSI reporting band #1, another wideband CSI of CSI reporting band #2, and subband CSI of each subband in CSI reporting band #1 by measuring at least one of the first type of CSI-RS or the second type of CSI-RS. The UE may report two wideband CSIs and subband CSIs to the BS in the CSI report.

[0143] For example, the UE may measure at least one CSI-RS of the first CSI-RS type preceding the associated CSI reference resource to derive wideband CSI for CSI reporting band #1, another wideband CSI for CSI reporting band #2, and subband CSI for each subband in CSI reporting band #1. For example, the UE may measure at least one CSI-RS of the first CSI-RS type and at least one CSI-RS of the second CSI-RS type preceding the associated CSI reference resource to derive wideband CSI for CSI reporting band #1, another wideband CSI for CSI reporting band #2, and subband CSI for each subband in CSI reporting band #1.

[0144] In some embodiments of the present disclosure, it is assumed that CSI reporting is configured with sub-band CSI reporting and aperiodic reporting.

[0145] In these embodiments, measuring at least one of the first type of CSI-RS or the second type of CSI-RS in operation 813 to derive a channel measurement or interference measurement for the CSI report may include measuring a CSI-RS in an opportunity associated with an aperiodic CSI report (denoted as CSI-RS#B). The CSI-RS may be an aperiodic triggered CSI-RS or a periodic or semi-persistent CSI-RS. The UE may derive at least one of a channel measurement or interference measurement for a first wideband CSI for CSI reporting band #1, a channel measurement or interference measurement for subband CSI for each subband in CSI reporting band #1, or a channel measurement or interference measurement for a second wideband CSI for CSI reporting band #2.

[0146] In some instances, when CSI-RS#B is a first type of CSI-RS (or when the associated timing has a first type of CSI-RS), measuring CSI-RS#B may include measuring the first type of CSI-RS to derive a channel measurement or interference measurement of at least one of wideband CSI for CSI reporting band #1 (denoted as wideband CSI#1C'), subband CSI for each subband in CSI reporting band #1, or another wideband CSI for CSI reporting band #2 (denoted as wideband CSI#2C').

[0147] For example, the UE may obtain only wideband CSI #1C' and the subband CSI of each subband in CSI reporting band #1 and report them to the BS in a CSI report. For example, the UE may obtain wideband CSI #1C', the subband CSI of each subband in CSI reporting band #1, and wideband CSI #2C' and report them to the BS in a CSI report. For example, whether wideband CSI #1C', wideband CSI #2C', the subband CSI of each subband in CSI reporting band #1, or any combination thereof should be reported may be based on a configuration from the BS or predefined, for example, in a standard.

[0148] In some examples, when CSI-RS#B is a CSI-RS of the second type (or when the associated opportunity has a CSI-RS of the second type), measuring CSI-RS#B may include measuring the CSI-RS of the second type to derive a channel measurement or interference measurement of wideband CSI for CSI reporting band #2 (denoted as wideband CSI#2D′) and subband CSI for each subband in CSI reporting band #2. The UE may report the wideband CSI#2D′ and the subband CSI for each subband in CSI reporting band #2 to the BS in a CSI report.

[0149] In some embodiments, considering that aperiodic CSI reporting is usually aimed at evaluating short-term transmission hypotheses, the UE does not need to report wideband CSI for CSI reporting band #1, wideband CSI for CSI reporting band #2, and subband CSI for both CSI reporting band #1 and CSI reporting band #2.

[0150] In some embodiments, each of the two types of CSI-RS is associated with a corresponding CSI reporting setting. In addition, each CSI reporting setting configures a corresponding (e.g., different) subband for CSI reporting. The two CSI reporting settings may be associated with each other based on a specific principle, for example, they are associated with the same CSI-RS resource setting or associated with associated CSI-RS settings, etc. The UE may report CSI for the associated CSI reporting settings simultaneously.

[0151] In some embodiments of the present disclosure, in order to save reporting overhead, the wideband CSI of CSI reporting band #2 (e.g., wideband CSI #2) may be quantized as a differential value relative to the wideband CSI of CSI reporting band #1 (e.g., wideband CSI #1). For example, the UE may determine the differential value of wideband CSI #2 relative to wideband CSI #1, quantize the differential value, and transmit the quantized differential value in the CSI report. In some embodiments, whether to use or report the differential value of CSI reporting band #2 is based on configuration. For example, a separate (or dedicated) configuration or a configuration of differential sub-band CSI reporting.

[0152] In some embodiments of the present disclosure, the UE may determine a CSI reference resource associated with a CSI report. In some embodiments, the CSI reference resource may be in a valid DL slot containing at least one DL or variable symbol or at least one symbol (e.g., SBFD symbol) of a UL subband.

[0153] Those skilled in the art will appreciate that the sequence of operations in the exemplary procedure 800 may be changed and some operations in the exemplary procedure 800 may be eliminated or modified without departing from the spirit and scope of the present disclosure.

[0154] Fig.11Exemplary CSI reporting according to some embodiments of the present disclosure is described.

[0155] exist Fig.11 In the example, it is assumed that the UE needs to transmit a CSI report in time slot n and that periodic or semi-persistent CSI reporting is configured for the CSI report. The CSI reference source associated with the CSI report may be defined at time slot m. The CSI report may be associated with a CSI resource with a CSI-RS transmission periodicity, such as Fig.11 Based on the CSI-RS transmission periodicity, the UE may determine multiple CSI-RS opportunities (eg, in time slots k1, k2, k3, and k4).

[0156] According to the above method (for example, based on the configuration and specific configuration of the CSI report), the UE can determine that time slots k1 and k3 are non-SBFD time slots with CSI-RS and time slots k2 and k4 are SBFD time slots with CSI-RS, and can determine that the first type of CSI-RS can be present in time slots k1 and k3 and the second type of CSI-RS can be present in time slots k2 and k4.

[0157] If time domain restrictions are configured for channel measurement or interference measurement of the CSI report, the UE may determine that the timing at which the CSI-RS associated with the CSI report satisfies the time domain restrictions is in time slot k2 having a CSI-RS of the second type (e.g., the nearest time slot with the CSI-RS associated with the CSI report before the CSI reference resource in time slot m).

[0158] The UE may determine a timing having a CSI-RS of the first type and satisfying the time domain restriction (e.g., the nearest time slot before the CSI reference resource in time slot m having a CSI-RS of the first type associated with the CSI report). For example, the UE may locate a CSI-RS timing in time slot k1 having a CSI-RS of the first type.

[0159] In some embodiments, it is assumed that the CSI report is configured with a wideband CSI report. In some examples, the UE may measure the CSI-RS in time slot k1 or measure the CSI-RS in both time slot k1 and time slot k2 to derive wideband CSI for CSI reporting band #1, and measure the CSI-RS in time slot k2 to derive another wideband CSI for CSI reporting band #2. The UE may report two wideband CSIs to the BS so that the BS may perform efficient link adaptation for PDSCH transmission in non-SBFD time slots (e.g., based on wideband CSI for CSI reporting band #1) and PDSCH transmission in SBFD time slots (e.g., based on wideband CSI for CSI reporting band #2).

[0160] In some embodiments, it is assumed that the CSI report is configured with subband CSI reporting. In some examples, the UE may measure the CSI-RS in time slot k1 or measure the CSI-RS in both time slot k1 and time slot k2 to derive wideband CSI for CSI reporting band #1 and subband CSI for each subband in CSI reporting band #1, and measure the CSI-RS in time slot k2 to derive another wideband CSI for CSI reporting band #2. The UE may report two wideband CSI and subband CSI to the BS so that the BS can perform efficient link adaptation for PDSCH transmission in non-SBFD time slots and SBFD time slots.

[0161] Fig.12 An exemplary CSI report according to some embodiments of the present disclosure is described. Fig.12 In , it is assumed that the UE is configured with CSI reporting with aperiodic CSI reporting.

[0162] refer to Fig.12 , the UE may receive DCI in time slot d. The DCI may trigger an aperiodic CSI report. In response to receiving the DCI, the UE may locate a timing for aperiodic CSI-RS transmission (e.g., in time slot k) and a timing for corresponding CSI reporting (e.g., in time slot n). The UE may further determine that time slot k is a SBFD time slot. That is, time slot k has a second type of CSI-RS. The UE may determine the wideband CSI of CSI reporting band #2 based on measuring the CSI-RS in time slot k. The UE may report the wideband CSI of CSI reporting band #2 to the BS.

[0163] In some examples, when the CSI report is configured with subband CSI reporting, the UE may further determine subband CSI for each subband in CSI reporting band #2 and may transmit the wideband CSI and subband CSI for CSI reporting band #2 to the BS.

[0164] Fig.13 1300 according to some embodiments of the present disclosure. The procedure 1300 may be performed by a BS (e.g. Figure 1 BS102) shown in the implementation.

[0165] refer to Fig.13 In operation 1311, the BS may determine a first type of CSI-RS and a second type of CSI-RS based on at least one CSI-RS resource setting and a specific configuration of the UE. The definitions of the first type of CSI-RS, the second type of CSI-RS, the CSI-RS resource setting, and the specific configuration described above are applicable here. The method for determining the first type of CSI-RS and the second type of CSI-RS described above is applicable here.

[0166] In operation 1313, the BS may receive a CSI report from the UE, wherein the CSI report may be derived based on at least one of the first type of CSI-RS or the second type of CSI-RS. The content of the CSI report, the method for deriving the CSI report, and the method for measuring at least one of the first type of CSI-RS or the second type of CSI-RS described above may be applicable here.

[0167] For example, in some embodiments of the present disclosure, a particular configuration may indicate a set of opportunities and physical resources within each opportunity in the set of opportunities.

[0168] In some embodiments of the present disclosure, a specific configuration may indicate at least one PDSCH rate matching mode, which indicates a physical resource within a timing group and each timing in the timing group, and wherein the physical resource cannot be used for PDSCH transmission. In some embodiments of the present disclosure, a specific configuration may indicate a set of timings (e.g., a set of SBFD time slots) with UL subbands and physical resources of UL subbands within each timing in the timing group. For example, in some embodiments of the present disclosure, a specific configuration may indicate a set of timings and physical resources within each timing in the timing group that cannot be used for CSI-RS transmission.

[0169] In some embodiments of the present disclosure, the first type of CSI-RS and the second type of CSI-RS may be determined based on a single CSI-RS resource setting and a specific configuration associated with a CSI report.

[0170] In some embodiments, a first type CSI-RS is present in a group of timings (e.g., timing group #1A) determined based on a single CSI-RS resource setting and excluding timings determined based on a specific configuration; and in each timing in the timing group (e.g., timing group #1A), the first type CSI-RS is present in a group of physical resources (e.g., physical resource #1A) determined based on a single CSI-RS resource setting.

[0171] In some embodiments, the second type CSI-RS is present in a group of opportunities (e.g., opportunity group #1B) determined based on a specific configuration; and in each opportunity in the opportunity group (e.g., opportunity group #1B), the second type CSI-RS is present in a group of physical resources (e.g., physical resource group #1B) determined based on a single CSI-RS resource setting and not including physical resources determined based on the specific configuration.

[0172] In some embodiments of the present disclosure, each of the first type of CSI-RS and the second type of CSI-RS may be determined based on a corresponding CSI-RS resource setting in at least one CSI-RS resource setting associated with a CSI report and a specific configuration.

[0173] In some embodiments, a first type CSI-RS is present in a group of timings (e.g., timing group #2A) determined based on a CSI-RS resource setting (e.g., CSI-RS resource setting #A) in at least one CSI-RS resource setting and excluding timings determined based on a specific configuration; and in each timing in the timing group (e.g., timing group #2A), the first type CSI-RS is present in a group of physical resources (e.g., physical resource group #2A) determined based on the CSI-RS resource setting (e.g., CSI-RS resource setting #A).

[0174] In some embodiments, the second type CSI-RS is present in a group of timings (e.g., timing group #2B) that is determined based on another CSI-RS resource setting (e.g., CSI-RS resource setting #B) in at least one CSI-RS resource setting and that only includes timings determined based on a specific configuration; and in each timing in the timing group (e.g., timing group #2B), the second type CSI-RS is present in a group of physical resources (e.g., physical resource group #2B) that can be determined based on another CSI-RS resource setting (e.g., CSI-RS resource setting #B) or can include physical resource group #2A that does not include physical resources determined based on a specific configuration.

[0175] In some embodiments of the present disclosure, the BS may determine the first CSI reporting band and the second CSI reporting band (eg, CSI reporting band #1 and CSI reporting band #2) based on a specific configuration. The method for determining two CSI reporting bands described above may be applicable here.

[0176] For example, in some embodiments of the present disclosure, a first CSI reporting band (e.g., CSI reporting band #1) may include subbands configured in the configuration of the CSI report, and a second CSI reporting band (e.g., CSI reporting band #2) may include subbands configured in the configuration of the CSI report and does not include subbands overlapping with frequency bands determined based on a specific configuration.

[0177] In some embodiments of the present disclosure, receiving a CSI report includes: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, then receiving at least one of a first wideband CSI for a first CSI reporting band or a second wideband CSI for a second CSI reporting band.

[0178] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, then receiving a first wideband CSI (e.g., wideband CSI #1A) of a first CSI reporting band and a second wideband CSI (e.g., wideband CSI #2A) of a second CSI reporting band derived based on measuring a first type of CSI-RS in a first opportunity (e.g., opportunity #1A) in which the CSI-RS satisfies the time domain restriction. In some examples, the BS may receive only the wideband CSI #1A from the UE.

[0179] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, then receiving a first wideband CSI (e.g., wideband CSI #1B) for a first CSI reporting band derived based on measuring a first type of CSI-RS in a second opportunity (e.g., opportunity #1B) satisfying the time domain restriction or based on measuring a second type of CSI-RS in a first opportunity (e.g., opportunity #1A) where the CSI-RS satisfies the time domain restriction and the first type of CSI-RS in the second opportunity, receiving a second wideband CSI (e.g., wideband CSI #2B) for a second CSI reporting band derived based on measuring the second type of CSI-RS in the first opportunity, or both. In some examples, the BS may receive only wideband CSI #2B from the UE.

[0180] In some embodiments of the present disclosure, receiving the CSI report includes: if the CSI report is configured with wideband CSI reporting and aperiodic CSI reporting, receiving at least one of first wideband CSI for a first CSI reporting band or second wideband CSI for a second CSI reporting band.

[0181] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a wideband CSI report and a non-periodic CSI report, then receiving at least one of a first wideband CSI for a first CSI reporting band (e.g., wideband CSI #1C) or a second wideband CSI for a second CSI reporting band (e.g., wideband CSI #2C) derived based on measuring a first type of CSI-RS (e.g., CSI-RS #A is a first type of CSI-RS) in a timing associated with the non-periodic CSI report.

[0182] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a wideband CSI report and a non-periodic CSI report, then receiving a second wideband CSI (e.g., wideband CSI #2D) for a second CSI reporting band derived based on measuring a second type of CSI-RS (e.g., CSI-RS #A is a second type of CSI-RS) in a timing associated with the non-periodic CSI report.

[0183] In some embodiments of the present disclosure, receiving a CSI report includes: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for the CSI measurement of the CSI report, then receiving at least one of a first wideband CSI for a first CSI reporting band, a second wideband CSI for a second CSI reporting band, or subband CSI for each subband in the first CSI reporting band.

[0184] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, receiving a first wideband CSI (e.g., wideband CSI#1A') of a first CSI reporting band derived based on measuring a first type of CSI-RS in a first opportunity (e.g., opportunity #1A') at which the CSI-RS satisfies the time domain restriction, a second wideband CSI (e.g., wideband CSI#2A') of a second CSI reporting band, and subband CSI of each subband in the first CSI reporting band. In some examples, the BS may receive only the wideband CSI#1A' and the subband CSI of each subband in the first CSI reporting band from the UE.

[0185] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and a time domain restriction is configured for CSI measurement of the CSI report, then receiving a first wideband CSI (e.g., wideband CSI #1B') of a first CSI reporting band derived based on measuring a first type of CSI-RS in a second opportunity (e.g., opportunity #1B') satisfying the time domain restriction or based on measuring a second type of CSI-RS in a first opportunity (e.g., opportunity #1A') where the CSI-RS satisfies the time domain restriction and the first type of CSI-RS in the second opportunity, receiving a second wideband CSI (e.g., wideband CSI #2B') of a second CSI reporting band derived based on measuring a second type of CSI-RS in the first opportunity, or both. In some examples, the BS may receive only the wideband CSI #2B' and the subband CSI for each subband in the second CSI reporting band.

[0186] In some embodiments of the present disclosure, receiving a CSI report includes: if the CSI report is configured with a subband CSI report and a non-periodic CSI report, then receiving at least one of a first wideband CSI for a first CSI reporting band, a subband CSI for each subband in the first CSI reporting band, or a second wideband CSI for a second CSI reporting band.

[0187] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a subband CSI report and a non-periodic CSI report, then receiving at least one of a first wideband CSI for a first CSI reporting band (e.g., wideband CSI #1C') derived based on measuring a first type of CSI-RS (e.g., CSI-RS #B is a first type of CSI-RS) in a timing associated with the non-periodic CSI report, subband CSI for each subband in the first CSI reporting band, or a second wideband CSI for a second CSI reporting band (e.g., wideband CSI #2C').

[0188] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a subband CSI report and a non-periodic CSI report, then receiving a second wideband CSI (e.g., wideband CSI #2D') for a second CSI reporting band derived based on measuring a second type of CSI-RS (e.g., CSI-RS #B is a second type of CSI-RS) in a timing associated with the non-periodic CSI report and subband CSI for each subband in the second CSI reporting band.

[0189] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a wideband CSI report and a periodic or semi-persistent CSI report and time domain restriction is not configured for CSI measurement of the CSI report, then receiving a first wideband CSI for a first CSI reporting band and a second wideband CSI for a second CSI reporting band derived based on measuring at least one of a first type of CSI-RS or a second type of CSI-RS.

[0190] In some embodiments of the present disclosure, receiving a CSI report may include: if the CSI report is configured with a subband CSI report and a periodic or semi-persistent CSI report and time domain restriction is not configured for the CSI measurement of the CSI report, then receiving a first wideband CSI for a first CSI reporting band derived based on measuring at least one of a first type of CSI-RS or a second type of CSI-RS, a second wideband CSI for a second CSI reporting band, and subband CSI for each subband in the first CSI reporting band.

[0191] In some embodiments of the present disclosure, receiving the second wideband CSI may include receiving a quantized value of a differential value of the second wideband CSI relative to the first wideband CSI.

[0192] In some embodiments of the present disclosure, the BS may determine a CSI reference resource associated with a CSI report, and wherein the CSI reference resource is in a valid DL slot containing at least one DL or variable symbol or at least one symbol with a UL subband.

[0193] Those skilled in the art should understand that the sequence of operations in the exemplary procedure 1300 may be changed and some operations in the exemplary procedure 1300 may be eliminated or modified without departing from the spirit and scope of the present disclosure.

[0194] Fig.14 A simplified block diagram illustrating an exemplary device for a UL subband in a full-duplex system according to some embodiments of the present disclosure. Fig.14 , the apparatus 1400 may include at least one processor 1406 and at least one transceiver 1402 coupled to the processor 1406. The apparatus 1400 may be a UE or a BS.

[0195] Although elements such as at least one transceiver 1402 and a processor 1406 are described in the singular form in this figure, the plural form may be considered unless explicitly stated to be limited to the singular form. In some embodiments of the present disclosure, the transceiver 1402 may be divided into two devices, such as a receiving circuit system and a transmitting circuit system. In some embodiments of the present disclosure, the device 1400 may further include an input device, a memory and / or other components.

[0196] In some embodiments of the present disclosure, the device 1400 may be a UE. The transceiver 1402 and the processor 1406 may interact with each other to perform Figures 1 to 13 In some embodiments of the present disclosure, the device 1400 may be a BS. The transceiver 1402 and the processor 1406 may interact with each other to perform Figures 1 to 13 The operation of BS is described in .

[0197] In some embodiments of the present disclosure, the device 1400 may further include at least one non-transitory computer-readable medium.

[0198] For example, in some embodiments of the present disclosure, a non-transitory computer-readable medium may store computer-executable instructions to cause the processor 1406 to implement the method described above with respect to the UE. For example, when the computer-executable instructions are executed, the processor 1406 interacts with the transceiver 1402 to perform Figures 1 to 13 The operations of the UE are described in .

[0199] In some embodiments of the present disclosure, a non-transitory computer-readable medium may store computer-executable instructions to cause the processor 1406 to implement the method described above with respect to the BS. For example, when the computer-executable instructions are executed, the processor 1406 interacts with the transceiver 1402 to perform Figures 1 to 13 The operation of BS is described in .

[0200] It will be appreciated by those of ordinary skill in the art that the operations or steps of the methods described in conjunction with the aspects disclosed herein may be directly embodied in hardware, a software module executed by a processor, or a combination of the two. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations or steps of the methods may reside as one or any combination or set of codes and / or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.

[0201] Although the present disclosure has been described with its specific embodiments, it is apparent that many substitutions, modifications and variations may be apparent to those skilled in the art. For example, the various components of the embodiments may be interchangeable, added or substituted in other embodiments. Moreover, all elements of each figure are not necessary for the operation of the disclosed embodiments. For example, it will enable those skilled in the art of the disclosed embodiments to make and use the teachings of the present disclosure by simply adopting the elements of the independent claims. Therefore, the embodiments of the present disclosure set forth herein are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0202] In this archive, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only comprises these elements, but also may comprise other elements that are not explicitly listed or inherent to this process, method, article or equipment. The element starting with "one" or the like does not exclude the existence of additional identical elements in the process, method, article or equipment comprising the element without more constraints. Moreover, the term "another" is defined as at least the second or more. As used herein, the term "having" and the like are defined as "comprising". For example, the expression of "A and / or B" or "at least one of A and B" may include any and all combinations of the words listed together with the expression. For example, the expression "A and / or B" or "at least one of A and B" may include A, B or both A and B. The wording "first", "second" or the like is only used to clearly illustrate the embodiments of the present disclosure, rather than to limit the substantive content of the present disclosure.

Claims

1. A user equipment UE, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Determine a first type of CSI-RS and a second type of CSI-RS based on at least one channel state information (CSI) reference signal (CSI-RS) resource setting and a specific configuration; and At least one of the first type of CSI-RS or the second type of CSI-RS is measured to derive a channel measurement or an interference measurement for a CSI report.

2. The UE according to claim 1, wherein the first type of CSI-RS and the second type of CSI-RS are determined based on a single CSI-RS resource setting associated with the CSI report and the specific configuration.

3. The UE according to claim 2, wherein the first type of CSI-RS exists in a first group of opportunities determined based on the single CSI-RS resource setting and excluding opportunities determined based on the specific configuration, and in each opportunity in the first group of opportunities, the first type of CSI-RS exists in a first group of physical resources determined based on the single CSI-RS resource setting; and Wherein the second type CSI-RS is present in a second group of opportunities determined based on the specific configuration, and in each opportunity in the second group of opportunities, the second type CSI-RS is present in a second group of physical resources determined based on the single CSI-RS resource setting and excluding physical resources determined based on the specific configuration.

4. The UE of claim 1 , wherein each of the first type of CSI-RS and the second type of CSI-RS is determined based on a corresponding CSI-RS resource setting in the at least one CSI-RS resource setting associated with the CSI report and the specific configuration.

5. The UE according to claim 4, wherein the first type of CSI-RS is present in a first group of opportunities determined based on a first CSI-RS resource setting in the at least one CSI-RS resource setting and excluding opportunities determined based on the specific configuration, and in each opportunity in the first group of opportunities, the first type of CSI-RS is present in a first group of physical resources determined based on the first CSI-RS resource setting; and wherein the second type of CSI-RS is present in a second group of opportunities that is determined based on a second CSI-RS resource setting in the at least one CSI-RS resource setting and includes only opportunities determined based on the specific configuration, and in each opportunity in the second group of opportunities, the second type of CSI-RS is present in a second group of physical resources, and wherein the second group of physical resources: Determined based on the second CSI-RS resource setting, or The first set of physical resources is included to exclude physical resources determined based on the specific configuration. 6 . The UE of claim 1 , wherein the processor is further configured to determine a first CSI reporting band and a second CSI reporting band based on the specific configuration.

7. The UE according to claim 6, wherein the first CSI reporting band includes subbands configured in the configuration of the CSI report, and the second CSI reporting band includes subbands configured in the configuration of the CSI report and does not include subbands overlapping with the frequency band determined based on the specific configuration.

8. The UE according to any one of claims 1 to 7, wherein the specific configuration indicates a set of occasions and physical resources within each of the set of occasions.

9. The UE according to claim 8, wherein the specific configuration indicates at least one physical downlink shared channel (PDSCH) rate matching mode, which indicates the set of opportunities and the physical resources within each opportunity in the set of opportunities, and wherein the physical resources cannot be used for PDSCH transmission; or wherein the specific configuration indicates the set of opportunities having uplink (UL) subbands and the physical resources of the UL subbands within each opportunity in the set of opportunities; or The physical resources within each of the set of occasions are unavailable for CSI-RS transmission.

10. The UE of claim 6, wherein measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive the channel measurement or interference measurement of the CSI report comprises: If the CSI report is configured with wideband CSI reporting and periodic or semi-persistent CSI reporting and time domain restriction is configured for the channel measurement or interference measurement, then: When a first opportunity when the CSI-RS satisfies the time domain restriction has a first type of CSI-RS, measuring the first type of CSI-RS in the first opportunity, or When the first opportunity has a CSI-RS of a second type, determining a second opportunity having a CSI-RS of the first type and satisfying the time domain restriction, and measuring at least one of the CSI-RS of the first type in the second opportunity or the CSI-RS of the second type in the first opportunity; and Wherein the processor is further configured to derive at least one of the channel measurement or interference measurement of the first wideband CSI of the first CSI reporting band or the channel measurement or interference measurement of the second wideband CSI of the second CSI reporting band based on the measurement of the at least one of the first type of CSI-RS and the second type of CSI-RS.

11. The UE of claim 6, wherein measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive the channel measurement or interference measurement of the CSI report comprises: If the CSI report is configured with a wideband CSI report and an aperiodic CSI report, measuring a CSI-RS in an opportunity associated with the aperiodic CSI report; and Wherein the processor is further configured to derive at least one of the channel measurement or interference measurement of a first wideband CSI for the first CSI reporting band or the channel measurement or interference measurement of a second wideband CSI for the second CSI reporting band.

12. The UE of claim 6, wherein measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive the channel measurement or interference measurement of the CSI report comprises: If the CSI report is configured with subband CSI reporting and periodic or semi-persistent CSI reporting and time domain restriction is configured for CSI measurement of the CSI report, then: When a first opportunity when the CSI-RS satisfies the time domain restriction has a first type of CSI-RS, measuring the first type of CSI-RS in the first opportunity, or When the first opportunity has a CSI-RS of a second type, determining a second opportunity having a CSI-RS of the first type and satisfying the time domain restriction, and measuring at least one of the CSI-RS of the first type in the second opportunity or the CSI-RS of the second type in the first opportunity; and Wherein the processor is further configured to derive at least one of the channel measurement or interference measurement for first wideband CSI for the first CSI reporting band, second wideband CSI for the second CSI reporting band, and subband CSI for each subband in the first CSI reporting band.

13. The UE of claim 6, wherein measuring at least one of the first type of CSI-RS or the second type of CSI-RS to derive the channel measurement or interference measurement of the CSI report comprises: If the CSI report is configured with a subband CSI report and an aperiodic CSI report, measuring a CSI-RS in an opportunity associated with the aperiodic CSI report; and wherein the processor is further configured to derive at least one of the channel measurement or interference measurement of a first wideband CSI for the first CSI reporting band, the channel measurement or interference measurement of subband CSI for each subband in the first CSI reporting band, or the channel measurement or interference measurement of a second wideband CSI for the second CSI reporting band.

14. A base station BS, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Determining a first type of CSI-RS and a second type of CSI-RS based on at least one channel state information CSI reference signal CSI-RS resource setting and a specific configuration of a user equipment UE; and A CSI report is received from the UE, wherein the CSI report is derived based on at least one of the first type of CSI-RS or the second type of CSI-RS.

15. A method performed by a user equipment UE, comprising: Determine a first type of CSI-RS and a second type of CSI-RS based on at least one channel state information CSI reference signal CSI-RS resource setting and a specific configuration; and At least one of the first type of CSI-RS or the second type of CSI-RS is measured to derive a channel measurement or an interference measurement for a CSI report.

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